10 Most Popular iPhone Business Apps

The smartphone application battle will heat up this month when BlackBerry maker Research in Motion (RIM) launches a direct competitor to Apple's iPhone application Store. Apple clearly has a formidable lead on this front with more than 15,000 applications available for download. However, RIM, with its strong corporate customer base, may very well change the focus from games to business. What are the most popular iPhone business apps available for purchase?

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